The Synthware™ Bubbler with PTFE Stopcock from Kemtech America Inc has small ball joints which can prevent mineral oil being sucked back under sudden negative pressure in the system.
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Synthware™ Bubbler with PTFE Stopcock, Top Joint: ST/NS 29/42, Bottom Joint: ST/NS 14/20, Kemtech America Inc (CAT#: STEM-L-1095-LKN) Synthware™ Bubbler with PTFE Stopcock, Top Joint: ST/NS 29/42, Bottom Joint: ST/NS 24/40, Kemtech America Inc (CAT#: STEM-L-1096-LKN)